Trailer jack



FIG. 1 is a front and top perspective view of a trailer jack showing my new design, the broken lines are for illustrative purpoes only and form no part of the claimed design;

FIG. 2 is an exploded bottom and left side perspective view thereof;

FIG. 3 is an exploded bottom and right side perspective view thereof;

FIG. 4 is a rear and top perspective view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for a trailer jack, as shown and described. 